With All Over Printing technique we can print;
1) Only Front
Back will be white because of the main colour of garment.
2) Only Back
Front will be white because of the main colour of garment.
3) Both Sides (+additional fees apply for double side printing)
You can use same image for both sides or different images for each sides. Also you can use plain colours (like just plain black) for back or front prints too.
It is all up to your imagination.